The site gives you a chance to test as well as improve your vocabulary. With each correct answer you provide, 20 grains of rice will be donated. The rice is paid for by the advertisers that you'll see at the bottom of the screen.

20 grains of rice sounds like very little but every little bit adds up. In just half an hour, you can accumulate thousands of grains of rice. Since FreeRice started in early October, they have donated nearly 5 Billion grains of rice. According to the BBC article, 1 Billion grains is sufficient to feed 50,000 people for one day.

There are plenty of fun meme's out there but writing a post about this site, as I have done after reading Cognitive Blindspot would be like doing a meme that also helps others. I believe the original meaning of a meme was the viral like transmission of a particular idea/topic from blogger to blogger. This looks like a good one to keep circulating.